Yup - "Leichter" translates into "lightweight" - not to be confused with "Leuchter"
And the fact that Sony offers a cover with built-in reading light strongly implies that the reader won't have an illuminated display on its own...
An eReader with retractable "Leuchter" would be awesome!!!
https://www.google.com/search?q=leuc...=lnms&tbm=isch
https://de.wikipedia.org/wiki/Kronleuchter
Just imagine the reactions of the people at the bus-stop, when you activate the magic "Leuchter"-Illumination...